الفهرس 
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Abstract
A total of 50 samples of raw prawn samples (25 each of prawn in-shell and peeled prawn) were randomly collected from different retail outlets at Kalyobia Governorate and transferred without undue delay to the laboratory where they were subjected to the bacteriologically examined.
The average aerobic plate count/gm of raw prawn in-shell and raw peeled prawn were 33 x 106 ± 8 x 106 and 86 x 107 + 23 x 107 organisms/gm respectively. Concerning the psychrotrophs, the mean counts were 63 x 105 ± 13 x 105 and IS x 106 + 3 x 106 in each of examined shelled and peeled prawn samples respectively Enterobacteriaceae and Coliform means counts were 57 x 105 + 5 x 105 and 5 x 102 + 1 x 102 organisms/gm of raw prawn in-shell while such counts were 9 x 103 + 3 x (Oland 3 x 102 + 0.5 x 102 organisms/gm of raw peeled prawn samples respectively.
Enterococci count was detected in most of examined raw shelled and peeled prawn samples with an average count 6 x 103 + 0.6 x 103 and 3 x
103 ± 0.5 x 103 organisms/gm respectively.
Staphylococcus aureus were existed in most of examined samples with an average of 12 x 104 ± 2 x 104 organisms/gm of raw prawn in shell and 9 x 103 + 1 x 103 organisms/gm in raw peeled prawn.
E. coli type I (Typical), Enterobacter aerogenes, Enterobacter aggulomerous, Enterobacter cloacae, klebsiella pneumonae, klebsiella aerogenes, klebsiella ed. var. edwardsii, Citrobacter frundii, proteus vulgaris, proteus morganii, proteus mirabilis and Arizona group could be isolated from both examined shelled and peeled prawn samples in a varying percentages; Strict hygienic regulations and specifications should be carried out to ensure a maximum of safety as well as to improve the quality of prawns. The public health importance of existing organisms has been discussed.